Heinz,
I would refer you to Angiers, "Firearm Blueing and Browning" p.96-97. of the volume that you reference.
A description of the Springfield Armoury browne process.
As far as I can determine these are the closest processes he describes that are similar to the Early German Rust Blue used on the Luger Pistols.
In each of the Springfield Armoury formulas I find the use of "Nitric Acid" and/or "Spirit of Nitre".
Out here in the backwoods of Va. there are very few if any "Industrial Chemists", so I turned to our local Pharmacist who has a background in Organic and In Organic Chemistry,
To my best understanding, He recommended that I experiment with making slight changes in these two constituents to influence the color quality.
My experience demonstrated that his point had value. He gave me the feeling that Nitre was a contributing factor in the rust blue process.
I'll not disclose more on this subject as I consider my work to be proprietary in the same manner as Thor.
I was not then, and am not now, interested in discussing the details of the Blueing Process.
I was simply attempting to answer a question and quickly describe in easy to understand, "if inexact", language, the similarities and differences of processes that have had many volumes written on the subject, and most still fall short of being clear to the casual reader.
If you are one of those who really understands Angier, you have my congratulations, "His work is very hard to follow".
Please forgive my inadvertent error in a poor choice of words in trying to simplify such a complex subject.
ViggoG
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